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Applied and Environmental Microbiology, October 2000, p. 4486-4496, Vol. 66, No. 10
Envirogen, Inc., Princeton Research Center,
Lawrenceville, New Jersey 086481;
Department of Geosciences, Princeton University, Princeton, New
Jersey 085442; Pacific Northwest
National Laboratory, Richland, Washington
993383; and Department of
Biological Science, Florida State University, Tallahassee, Florida
323064
Received 3 May 2000/Accepted 23 July 2000
Previous bacterial transport studies have utilized fluorophores
which have been shown to adversely affect the physiology of stained
cells. This research was undertaken to identify alternative fluorescent
stains that do not adversely affect the transport or viability of
bacteria. Initial work was performed with a groundwater isolate,
Comamonas sp. strain DA001. Potential compounds were first
screened to determine staining efficiencies and adverse side effects.
5-(And 6-)-carboxyfluorescein diacetate, succinimidyl ester (CFDA/SE)
efficiently stained DA001 without causing undesirable effects on cell
adhesion or viability. Members of many other gram-negative and
gram-positive bacterial genera were also effectively stained with
CFDA/SE. More than 95% of CFDA/SE-stained Comamonas sp.
strain DA001 cells incubated in artificial groundwater (under no-growth conditions) remained fluorescent for at least 28 days as determined by
epifluorescent microscopy and flow cytometry. No differences in the
survival and culturability of CFDA/SE-stained and unstained DA001 cells
in groundwater or saturated sediment microcosms were detected. The
bright, yellow-green cells were readily distinguished from
autofluorescing sediment particles by epifluorescence microscopy. A
high throughput method using microplate spectrofluorometry was developed, which had a detection limit of mid-105
CFDA-stained cells/ml; the detection limit for flow cytometry was on the order of 1,000 cells/ml. The results of
laboratory-scale bacterial transport experiments performed with
intact sediment cores and nondividing DA001 cells revealed good
agreement between the aqueous cell concentrations determined by the
microplate assay and those determined by other enumeration methods.
This research indicates that CFDA/SE is very efficient for labeling
cells for bacterial transport experiments and that it may be useful for other microbial ecology research as well.
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Development of a Vital Fluorescent Staining Method for Monitoring
Bacterial Transport in Subsurface Environments
*
Corresponding author. Mailing address: Envirogen, Inc.,
Princeton Research Center, 4100 Quakerbridge Road, Lawrenceville, NJ
08648. Phone: (609) 936-1815, ext. 169. Fax: (609) 936-9221. E-mail:
fuller{at}envirogen.com.
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